Practical navigation, or, An introduction to the whole art containing many useful and geometrical definitions and problems; the doctrine of plain and spherical triangles; plain Mercator, and great-circle sailing; sundry useful problems in astronomy; the use of instruments; the azimuth-compass, ring-dial, variation-compass; the fore-staff, quadrant, plough, and nocturnal; the plain scale, Gunter's scale, sinical quadrant, plain-chart, Mercator's chart, both globes, the inclinatory-needle, and virtues of the loadstone. Useful tables of the moon's age, of the tides, of the sun's place, declination, and right-ascension; of the stars right-ascension and declination; the latitude and longitude of places; and a table of meridional parts : likewise a new traverse-table, and the use thereof in keeping a reckoning at sea : also a table of 10000 logarithms, and of the log. sines, tangents, and secants /